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'88 electrical; 4th gear switch function?

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  • #1

    '88 electrical; 4th gear switch function?

    I've been searching the archives here regarding tranny swaps.

    I want to replace my 4 speed with a 5 speed Festiva tranny. It's a direct swap.

    I could not find any information about the 4th gear switch that sends a signal to the ECM. I guess this switch just tells the computer to de-activate the "shift-up" light. If that's all it does, I won't even try to put it on the 5 speed.

    Does it serve any other function?
    '88 Festiva L, stock carby engine (with exhaust upgrade), 4 speed tranny. Aspire Struts and Springs, Capri 14" wheels, interior gutted, battery in back

    '92 Geo Metro XFi

    '87 Suzuki Samurai

    '85 F150, modded 300cid
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  • #2
    Don't know it's function but looking in the Haynes manual wiring diagrams it only shows up in the 88-89 carburetted engine. Don't know if they offered a 5-speed in 88-89. Hope that helps.
    Original owner of silver grey carburetted 1989 Festiva. 105k km as of June 2006. 140k km as of June 2021.

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    • #3
      yeah it's just there to eleminate the "shift up" light while in 4th gear
      Trees aren't kind to me...

      currently: 2 88Ls (Scrappy and Jersey), 88LX, 90L(Pepe), 91L, 91GL (Skippy) 93 GL Sport (the Mighty Favakk), 94 (Bruce) & 95 Aspire SEs, 97 Aspire (The Joker),
      94 Justy 4WD, 87 Fiero GT, plus 2 parts cars. That's my fleet.

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